How to calculate "'estimated quality" of a JPEG

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serge73
Posts: 1
Joined: Wed Nov 30, 2022 1:42 pm

How to calculate "'estimated quality" of a JPEG

Post by serge73 »

I would like to know how xnview calculates the "'estimated quality" of a jpeg.

I want to write a program to determine if photos are > 70% of quality to compress them.

Thank you for your help

Serge